[player] Prevent long audio track label from pushing controls off-screen

- audioTrackTextView: layout_width=0dp + layout_weight=1
- Make it singleLine with ellipsize="end"
- When not fullscreen, hide metadataView so an empty weighted container doesn’t reserve space
- Result: controls stay visible on small screens; longer labels can use space on larger screens

app/src/main/res/layout/player.xml

@@ -160,12 +160,15 @@
 
                     <org.schabi.newpipe.views.NewPipeTextView
                         android:id="@+id/audioTrackTextView"
-                        android:layout_width="wrap_content"
+                        android:layout_width="0dp"
                         android:layout_height="35dp"
                         android:layout_marginEnd="8dp"
+                        android:layout_weight="1"
                         android:background="?attr/selectableItemBackground"
                         android:gravity="center"
                         android:minWidth="0dp"
+                        android:singleLine="true"
+                        android:ellipsize="end"
                         android:padding="@dimen/player_main_buttons_padding"
                         android:textColor="@android:color/white"
                         android:textStyle="bold"